Firstly, I agree with NiobiumTragedy, that you're looking for a way out. Your posts don't sound like you love this guy. They sound more like you're just frustrated with him for dragging his feet, and he sounds like he's frustrated with you for wanting to get married at all. I would advise you to seriously consider what marriage will do. If you set a date, and pressure him into marriage, you may find bitterness and resentment in the years to come. If you just live together, you will feel guilty, and likely become bitter and resentful of him. If you move out, I seriously doubt if the relationship will last, and if it does, based on what I've read here, I doubt if it would be a healthy relationship.
Firstly: the kid is the most important aspect now. This isn't about what you would like, or what your fiance would like; it's about what is best for the kid. Also, your fiance doesn't seem capable of making his own decisions. For whatever reason, marriage seems to terrify and upset him which suggests that he is entirely unprepared for this. Not good. You want a man who will be a committed husband, and an attentive father.
Secondly: you don't seem as though you really know what to do. I commend your desire to get out of living in sin, however marriage may not be the best option for you. In fact, I think the best decision would be to end this relationship. Either figure out what it is you really want from this relationship, and enforce any necessary boundaries, or accept that the likely hood of a happy ending here is not great and walk away. Or, if you really think marriage is best for the kid, marry with the knowledge that this may not be the greatest of marriages. How can it be when you want the marriage, and he doesn't? Also, is it HIM you want, or the "wife" title?
Again, this is merely based on the little you have posted. Which, by the way, defensiveness is not necessary. You came to this forum asking for help. Not everyone is going to see a silver lining, not everyone is going to post a silver lining option for you, so don't get upset and defensive at those who've taken time to offer advice. If you want a direct answer, give more direct info.